Re: [DMCForum] It seems too simple.. Why has no one built it forproduction yet?

[Martin Gutkowski <martin@xxxxxxxxxxxxxx>]

The simple question I asked when reading these patents is "why?"

Who decided that pre-heating the fuel to the point of vapourisation 
would make for a more efficient burn? Seems to me you're wasting energy 
heating it up to start with, and losing the energy released when it 
transfers from a liquid to a gas.

Remember where petrol's concerned, the liquid doesn't burn anyway, the 
vapour burns. Your injectors are atomising the fuel stream - making the 
surface area of the droplets as large as possible encouraging 
vapourisation. Once ignited, the heat and compression soon takes care of 
the rest and you get the entire benefit of the expansion within the 
combustion chambers.

Or look at LPG - commonplace over here now are LPG conversions. 
Liquified Petroleum Gas, is a propane/butane mix and as the name 
suggests, normally a gas. It's a liquid in a pressurised tank in your 
car, then injected as a gas into your engine. Typically about 20% by 
volume less efficient/powerful than petrol, but much cleaner so big tax 
breaks from the government on the cost of the stuff.

I drive a direct injection diesel engined car. The principle is to 
enable the fuel to be injected into the combustion chamber -already 
under compression- to allow for the leanest possible burn, eliminating 
the possibility of knocking. Fir interest, the primary fuel pump runs ar 
5000psi.

It occurred to me that you could do that with a petrol engine - if you 
could inject direct to the cylinders, you could actually run a petrol 
engine using compression ignition, allowing the lean running diesels 
achieve. Turns out Alpha Romeo have done it, and they're notoriously 
unreliable and run extremely hot. What a surprise!

Martin



Marc Levy wrote:

>http://patft.uspto.gov/netahtml/srchnum.htm
>
>Check out USPN: 5,398,663 
>and USPN: 4,862,859
>
>
>  
>

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